4.3 PTR :: I See what You did Thar...

Zul'Gurub

• Players now only have to kill two of the four initial dungeon bosses (High Priest Venoxis, Broodlord Mandokir, High Priestess Kilnara, and Zanzil) to face Jin’do the Godbreaker.

Zul'Aman

• Players now only have to kill two of the four Troll avatars before they may face Hex Lord Malacrass.
  
  Source.

Oh look. There I was, thinking that people would suck it up and just run these two instances without moaning they were too long or too difficult. Clearly someone had a quiet word in the collective Blizzard ear, or maybe (gasp) they had planned this from the get-go. That means you'll blitz through Venoxis, do Mandokir and not even bother to progress any further than the not just optional but utterly skippable Archaeology boss: straight past Gubb and off to Jin'do. Job done.

If you want that ZA mount in a PuG, you have until 4.3 to get it. They don't need to take it out, no one will bother doing it in a random. Think of all the re-coding time this change will save.

I am not a big fan of dumbing stuff down to make it faster :(